Stationary grate for furnaces



H. GOEHTZ.

STAT IONARY GRATE FOB FURNACES. APPLICATION FILED JAN. 14, 1922.

1,413,400, Patented Apr. 18, 1922.

2 SHEETS-SHEET I.

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H. GOEHTZ. STATIONARY GRATE FOR FURNACES.

' APPLICATION FILED um. 14. I922.

1,41 3,400; I Patented Apr. 18, 1922b 2 SHEETS-SHEET 2.

Hermann GOEH'I'Z, or

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s'rarronanr ena'rn ran races. I

Specification of Letters Patent. Apr; 18 1922- Application filed January 14,1922. ser al Ho. 52a,

7 '0 all it may concern:,

citizen of the Republic of Germany, residing at Berlin-Schoneberg, Germany, have in-- vented certain new and useful -I m roveratesments in or Relating to Stationary for Furnaces, of which the following is aspecification.

' This invention has reference generally to improvements in furnaces and more particularly relates to a stationary circular grate for use in furnaces, generators and gas producers, etc.

In general, stationary flat grates in furnaces and generators extend mainly over the whole of the sectional area thereof and the grates usually consist of a number of independent bars or bars connected to gether in series and each having a vertical web. In grates of this character the openings or air spaces between the fire bars are 30 mm. or less in diameter. Inasmuch as lignite or brown coal or similar solid fuel has a tendency to fall to dust when burnt on a grate of this kind most of the fuel will drop to the pit through said air spaces.

It-is the object of this invention to provide a stationary flat grate in-which this defect is remedied and the coal dust and ashes are prevented from prematurely falling through the grate openings. To accomplish this purpose the depending flanges of the grate bars are inclined obliquely with respect to the upper surface of the grate, so that the air spaces between the bars of the grate are correspondingly inclined instead of being arranged vertically .as has heretofore been the case in flat grates. By this improved arrangement the coal dust and ashes are supported by the wide flanges of the bars and cannot pass freely into the pit.

Other objects as well as the nature, characteristic. features and scope of this invention may be more readily apparent from the following description taken in connection with the accompanying drawings and pointed out in the claims forming a part of this specification.

The invention is clearly illustrated in the accompanying drawings, in which Fig. 1 is a vertical section taken through a furnace showing the improved grate and the parts connected therewith, and

.Fig. 2 is a transverse section taken on the line 2-2 of Fig. 1.

Similar characters of reference are employed in the above described views to indi- Be it known that I, HERMANN GOEHfIZ,

cate corresponding parts, 1 W

Referring now, more, particularly, to the accompany ng drawingsthere is provided a furnace in :which is interposed a revolving water basin f carrying concentrically of'the bottom thereof an upright supporting structure g provided with a reduced central head or neck h. This neck is arranged through the center of a circular flat grate i, the lat-.

ter in turn being supported by the ash pit hthrough 'the mstrument ality of radially arranged supporting members Z. In this connection it is to be observed that the ash pit k is preferably made of cast-iron and the supporting members Z are likewise of similar material. The outer or peri heral annular bar of the grate is formed wlth a plurality of water troughs m for the purpose of cooling the circumferential portion of the grate surface to prevent the latter from destruction by fire and heat in case the main combustion zone of the greatest heat inten-- pose-ofabout 45 it is retained on' the.

grate owing to-the roughened faces of the flanges beneath the air spaces and accumulates on the grate in a similar manner as on a stepped grate. I

For the removal of the ash accumulating on the grate the neck 71; of the supporting structure 9 carries a scraping means preferably rigidly connected therewith. This scraping means is in the form of two curved hollow arms n extending from the head 71.

radially in opposite'directionsand having a segmental cross section with the open side resting on the grate surface. It is preferred that this two-armed v scraping member be cooled by blast air.

When the device is in operation the scraping arms n are caused to move over the grate surface and owing to their particular 'shape and movement act to drive the ash from the grate surface into the annular free spaces between the bars, so that the ash is lll gradually moved down on the inclined flanges of the grate bars until it drops into the water basin f. The coarser particles of ash and slag however are moved by the scraping arms at over the grate surface towards the periphery thereof until they'drop over the outer edge of the circular grate into the narrow annular passage obetween the grate and the walls of the furnace and through this passage into the water basin f. .From the latter the slag and the other residues of the consumed fuel are adapted to be thrown out over the edge or margin of the basin with the aid of a rising wall or blade (not shown).

It is believed in view of the foregoing that a further detailed description of the invention is entirely unecessary. Likewise it is believed that the advantages of the invention will be readily apparent.

What is claimed by the invention and desired to be secured by Letters Patent is 1. In a device of the character described, in combination, a stationary circular flat grate composed of a plurality of circular bars each having an obliquely inclined flange depending therefrom, and scraping means rotatable over the grate surface.

2. In a device of the character described, in combination, a stationary circular flat grate composed of a plurality of circular bars each having an obliquely arranged and depending flange, a revolving water basin located below the grate, a supporting structure' arranged within and carried by the bowl and having a portion projecting through and above the grate, and scraping arms carried by the supporting structure and movable over the grate surface upon the rotation of the water basin.

3. In a device of the character described,

in combination, a stationary circular flatgrate composed of a plurality of circular bars each having an obliquely disposed flange depending therefrom, and rotatable hollow scraping ar'ms having their open bottoms disposed on the upper'surface of the grate and adapted to receive an air cooling blast,

and means for rotating the arms.

4. 'A stationary circular fiat grate composed of a plurality of circular bars each cular flat grate composed of a plurality of circular bars each having an obliquely disposed flange depending therefrom and a peripheral bar enclosing the other bars and shaped to form water troughs, a rovolving Water basin located below the grate, a supporting member arranged within the basin and having a reduced neck projecting through the grate and scraping arms carried by the neck of the supporting structure and movable over the upper surface of the grate during the revolving of the water basin.

\ 7. A device of the character described, comprising incombination, a stationary circular flat grate composed of a plurality of circular bars each having an obliquely disposed fiange depending therefrom, a revolving water basin located below the grate, a

supporting member arranged Within the 7 said basinhaving a reduced neck projecting through the grate centrally thereof, and

scraping arms of hollow form and open atthe bottom secured to said member and engageable with the upper surface of the grate for movement thereover upon the revolving of the bowl and being adapted to receive an air blast.

In testimony whereofI afiix my signature in presence of two witnesses.

HERMANN GOEHTZ. Witnesses:

HAM NEIMANN, KARL Maxims. 

